AD8212S - High Voltage Current Shunt Monitor | Analog Devices
MPN: AD8212S ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.5 | $2.50 |
| 10 | $2.25 | $22.50 |
| 100 | $2 | $200.00 |
| 500 | $1.8 | $900.00 |
| 1,000 | $1.94 | $1,940.00 |
AD8212S Overview
A current shunt monitor is a specialized amplifier that measures the voltage drop across a sense resistor placed in series with a load, converting this small differential voltage into a proportional output signal. In high-side sensing, the monitor must reject the large common-mode voltage present at the shunt, which can be tens or hundreds of volts above ground. The AD8212S excels in this role, providing accurate current measurement without requiring level shifting or isolation, simplifying the design of motor control, solenoid control, and power management systems.
Key features of the AD8212S include a wide common-mode input range of 4.5 V to 65 V (extendable beyond 500 V with an external PNP), a current output that simplifies interfacing with ADCs or comparators, and a wide operating temperature range of -40°C to +125°C. The device operates from a single 5 V supply and draws a low quiescent current, making it suitable for automotive and industrial environments. Its high common-mode rejection ensures accurate current sensing even in noisy power systems.
The AD8212S uses a precision bipolar process to achieve low offset and gain drift over temperature. The current output can be converted to a voltage with an external resistor, allowing flexible scaling. The device is available in a compact SOIC-8 package, which is pin-compatible with the standard AD8212, and is specified for operation over the extended temperature range, making it suitable for harsh environments.
Typical applications include high-side current sensing in motor control, solenoid control, battery monitoring, and power supply monitoring. The device is also used in automotive systems for load detection and diagnostics. Its ability to handle high common-mode voltages with minimal external components makes it a preferred choice for robust current sensing.
When designing with the AD8212S, ensure the supply voltage is within the specified range and the output resistor is chosen to keep the output voltage within the ADC's input range. The external PNP transistor, if used, must be selected to handle the required common-mode voltage and current.
Drop-in alternatives for AD8212S — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD8212
✅ Drop-In📋 Reference alternative (not in catalog)
AD8210
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD8212S Maximum Ratings & Electrical Characteristics
| Common-Mode Voltage Range | 4.5 V to 65 V |
| Common-Mode Voltage with External PNP | >500 V |
| Supply Voltage | 5 V |
| Output Type | Current |
| Operating Temperature Range | -40°C to +125°C |
| Package | SOIC-8 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
AD8212S Pin Configuration
| Pin 1 | IOUT — Current output |
| Pin 2 | GND — Ground |
| Pin 3 | -IN — Inverting input |
| Pin 4 | +IN — Non-inverting input |
| Pin 5 | VS — Supply voltage |
| Pin 6 | NC — No connect |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
Typical Applications
AD8212S is suitable for 6 applications: Motor Control, Solenoid Control, Battery Monitoring, Power Supply Monitoring, Automotive Load Detection, Industrial Process Control.
Motor Control
The AD8212S is ideal for high-side current sensing in motor control applications. Its wide common-mode voltage range of up to 65 V (or >500 V with an external PNP) allows direct connection to motor supply rails. The current output can be easily converted to a voltage for ADC input, enabling precise torque and speed control. The device's high common-mode rejection ensures accurate measurement even with noisy motor currents, and its extended temperature range (-40°C to +125°C) suits industrial and automotive environments.
Recommended
Solenoid Control
In solenoid control systems, the AD8212S monitors the current through the solenoid to detect faults and ensure proper operation. Its high common-mode voltage capability allows sensing on the high side of the solenoid, simplifying the circuit. The current output can be compared to a threshold to detect open or short circuits. The device's wide temperature range and robust design make it suitable for automotive and industrial solenoid drivers.
Recommended
Battery Monitoring
The AD8212S is used in battery monitoring systems to measure charge and discharge currents. Its ability to handle common-mode voltages up to 65 V makes it suitable for monitoring individual cells or entire battery packs. The current output can be integrated over time to estimate state of charge. The device's low quiescent current and high accuracy contribute to efficient battery management in electric vehicles and portable devices.
Recommended
Power Supply Monitoring
In power supply monitoring, the AD8212S measures the output current of a power supply to detect overloads and ensure proper regulation. Its high common-mode voltage range allows sensing on the output rail, which may be significantly above ground. The current output can be fed to an ADC or comparator for monitoring and protection. The device's accuracy and temperature stability ensure reliable operation in various power supply designs.
Recommended
Automotive Load Detection
The AD8212S is used in automotive systems to detect and monitor loads such as lights, heaters, and motors. Its extended temperature range (-40°C to +125°C) and high common-mode voltage capability make it suitable for under-hood applications. The current output can be used to detect open or short circuits, enabling diagnostics. The device's small SOIC-8 package and low component count simplify integration into automotive electronic control units.
Recommended
Industrial Process Control
In industrial process control, the AD8212S monitors currents in actuators, valves, and other equipment. Its high common-mode voltage range and accuracy enable precise current measurement in harsh industrial environments. The current output can be transmitted over long distances without significant loss, making it suitable for remote monitoring. The device's wide temperature range and reliability ensure continuous operation in demanding applications.
Recommended
Recommended Products Summary
Engineering reference data for AD8212S — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD8212 | AD8210 | AD8211 |
|---|---|---|---|---|
| Package | SOIC-8 | SOIC-8 | SOIC-8 | SOT-23-5 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Common-Mode Voltage Range | 4.5 V to 65 V | 4.5 V to 65 V | 2 V to 65 V | 2 V to 65 V |
| Output Type | Current | Current | Voltage | Voltage |
| Operating Temperature Range | -40°C to +125°C | -40°C to +85°C | -40°C to +125°C | -40°C to +125°C |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
Key Differentiators
- Extended temperature range (vs AD8212)
- High common-mode voltage capability (vs AD8211)
- Current output simplifies interfacing (vs AD8210)
Design Notes
Place the sense resistor close to the AD8212S inputs to minimize parasitic inductance and resistance. Use Kelvin connections to the shunt to ensure accurate voltage sensing. Keep the input traces short and shielded from noisy power traces to maintain high common-mode rejection.
The AD8212S operates from a 5 V supply. Ensure the supply is well decoupled with a 0.1 uF ceramic capacitor placed close to the VS pin. The supply current is low, but proper decoupling prevents noise from affecting the measurement accuracy.
When using an external PNP transistor to extend the common-mode voltage beyond 65 V, ensure the transistor's breakdown voltage exceeds the maximum common-mode voltage. Also, verify that the transistor's base current does not affect the measurement accuracy. Refer to the datasheet for the recommended transistor configuration.
Compliance Information
RoHS compliant per Analog Devices product page. Other compliance data not specified in the provided data.
